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Ben the Ignorant

...and your simple lenses are stranger than you think

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    • By billyb93
      I currently have a Canon T6 with a Opteka 500mm f8 lens ($87) that I use for lunar and solar photography. I recently purchased a full frame Canon EOS R and am thinking about getting a 800mm f11 Canon RF lens ($899). Will the quality on the new canon lens be significantly better than my Opteka lens? Is it worth the upgrade? Also, should I use my new full frame or my crop sensor (1.6 factor) to shoot? I want to get the best quality possible. 
    • By Dippy
      Baader optical wonder solution is practically Isopropyl alcohol. Instead of £12 for a 70mL of it, buy a 1000 mL of Isopropyl alcohol for £22 (before pandemic it was only £5). They have also smaller bottles which will be cheaper of course. The Baader solution and Isopropyl alcohol don’t remove the toughest of fungi on optics, only a few of the less deep set ones can be treated with them. I have used both for cleaning eyepieces and on certain stage of cleaning several 8 to 12 inch mirrors. They both worked identical. When applied through an optical cleaning fabric, they remove ( dissolve) fatty oils and fingerprints on optical surfaces. I had cleaned a 12 inch mirror once which for some unknown reason had ice cream stain on it (cleaning followed standard operation procedure for cleaning coated aluminised mirrors).
    • By Corpze
      So, I have been testing three different kind of lasers, each one is supposed to be the "best" in each category or what you want to call it, the hotech and HG is almost the same, but whit the difference in how you lock it down.
      The Catseye is very different in how it works.

      I made a Youtube video of my thoughts

      https://youtu.be/ERF33hNVieQ

      What do you think? which one do you use?

      Regards, Daniel


       

    • By Varavall
      I sell my refurbished Nikon 300mm AF-S VR f2,8G ED with Nikon warranty until September 2020. I am selling as my interests require different equipment. It is in excellent functional state, the tripod mount and the original Nikon hood have wear commensurate with normal use. This objective is excellent for wildlife photography, astrophotography and sports photography. Also included is a set of Gobe neutral density filters to enable long exposure in bright conditions. I would consider exchange, with monetary adjustment if necessary, for something for astronomy such as Takahashi telescopes and/or quality equatorial mount.
       
      Price £1900 (Current model available new for around £5500)







    • By RH323
      I'm fairly new and on one of my daily stargazing sessions I viewed, with the naked eye, a huge passing light going SE, from my perspective it was brighter and bigger than any stars, planets or meteors that I've seen before. It was roughly the size of a baseball. 
      If this was a star -> . 
      this is roughly how big it looked -> O
      It had a trail of similar size, seemingly dusty. It also passed and disappeared between Corona Borealis and one of Hercules' legs. 
      Viewed on May 16th, 22:00- 23:40 
       
      I assumed, based on recent headlines, that it was Comet Swan, but upon further investigation, that was far from true. 
      Comet Swan should not be visible with the naked eye, and definitely not to the degree I saw. Additionally, based on my coordinates* it wouldn't even cross the sky I saw, it would be below the horizon. 
      (*roughly 15 °N, 120 °E, PH)
       
      Considering again the magnitude of the object amd the fact that I viewed it with the naked eye discounts it from being an asteroid or meteor*. 
      (*More possible but still hard to believe with its size, you wouldn't even see something like that during meteor showers)
       
      So I then researched if it could be space debris. I thought that something as big as that should be covered by a news article somewhere. 
      *The only results were of the 18 ton Chinese Rocket but it couldn't be that because:
      A. It passed over Los Angeles and New York then fell into the Atlantic Ocean, with some pieces landing in Africa. Meaning it wouldn't pass over my country.
      B. That happened 5 days before my viewing, on May 11 at 11:33 AM ET (08:33 PDT)
       
      It's still possible but it just seems unlikely, and with how big it was I'd assume that it would attract some media attention but I cant find anything else. 
      Does anyone have any idea what it could have been? I have to know. If it was debris then all I need is confirmation.  
       
      *
      https://www.google.com/amp/s/www.cnbc.com/amp/2020/05/16/chinese-rocket-falls-to-earth-space-debris-problem-worsens.html
      https://www.google.com/amp/s/www.theverge.com/platform/amp/2020/5/13/21256484/china-rocket-debris-africa-uncontrolled-reentry-long-march-5b
       
       
       
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